Tool for sharpening plows



(No Model.)

RNELSON. TOOL FOR SHARPENING FLOWS.

Patented Aug. 8, 1893.

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Tool. FOR SHARPENING PLows.

SPECIFICATION forming leert ef Lettere Patent Netcare?, dated August s, 189s.

.Application 'lledDeoemher 14, 1891. Serial No.v L115,058. (No model.)

To @ZZ whom it may concern:

Be it known that I, ERIoK NELSON, a citizen of the United States, residing at. St. Paul, in the county ofRams'ey and State of Minnesota, have invented certain new and useful Improvements in Tools for Sharpening Plows; and I do declare the following tov be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specication. f

The object of my invention is to provide a combination tool for the purpose of, first, setting or straightening iron or steel edged tools; second, sharpening the edge of such tools, and third, by compression and friction, hardening, strengthening and Iinishin g such sharpened edges.

The invention is illustrated-in the accompanying drawings, in which- Figure l, is a view of the face of the tool carrying the sharpening dies; Fig. 2, a cross sectional view of the tool facing the sharpening and rolling dies; Fig. 3, a view of the face carrying the rollin'gdies; Fig. 4, a side view of the tool, showing" one of the sharpening dies in section; and Fig.' 5, is a View illustrating the eccentric mounting of the studsof the finishing rollers.

Similar letters refer to similarparts throughout the .several views.;

The base or foundation of the tool consists of a plate A, havinga ferrule or shank B, for attaching a handle, which may be of Wood and of any desired-length.

In the end of theplateV A, is a longitudinal recess C, forming jaws upon each side for-the purpose of grasping aplowshare orpoint, and enabling it to be set, straightenedor'other- Wise bent to a proper shape.

Upon one side of the platel A, Aandjn ya plane substantially at right angles thereto, are mounted upon a bracket D, the two diskshaped sharpening dies, E, E. d Theseare eccentrically and rotatively mounted upon studs F, F, to admit of adjustment thereupon, to

regulate the distance apart o f the cutting edges of the dies and to enable a new-part of the cutting edge tobe kbrought into place of service incase of wear.' The periphery of each die -is slightly tapering or concaved, as shown at G, to give greater acuteness to the edge," and to 'effect this obj ect to astill greater degree, the adjacent plane face of the die has formed therein close to its edge an annular concave groove H. The -dies are made of hardened-steel, and operate b v shaving the instrument to a ner edge when drawn along the same. The periphery of one of the dies is attened or made straight for a short distance, as at I, in Fig. 2,for the purpose, when desired, of sharpening the edge of an instrument on one side only, the flattened or straightened part of the die being so adjusted as to bear against the side of the edge of the instrument which is not to be sharpened opposite the other die by which the sharpening is effected. t d

The iinishing rollers, K,`K, are two hardened, convexly-taperedu steel rollers, revolving on eccentrically-mounted studs, L,L, and placed side by side upon-the opposite side of the plate A, from the sharpening dies. The edges ofthe instrumentbeing inserted and drawn throughbetween the rollers, or the latter being caused to `revolve under pressure along eitherside, are, bythe compression of the rollers and thefriction-produced, made to come to a-flne edge, and the same hardened and made moredurable.v -The studs L, have a shoulder M, which abuts against the plate A, to admit of the's'ame being drawn rigidly into place' thereupon bytheir nuts N, and the eccentricity ofi-the stud-iseffeoted by giving4 the tenon orpart which' enters the plate a different center from-that of the part of the stud carrying the roller K. By loosening the nuts .N, the studs may be adjusted to bring the faces of the rollers close together or at differ- ,ent distances apart, to provide for `the finishing of edges-beveled to different angles, or to compensate-forl wear-upon the rollers.

The adjustment of the sharpening dies E, E, may-,be. effectedubyymounting the dies themselves eccentrically upon the studs, or

by mounting the studs eccentrically in the bracket D, in the same manner as in the case of the roller studs.

I claim as my invention- 1. In a tool for sharpening or shaving the edges of metal instruments, hardened steel f disk-shaped dies each having a tapering peripheral face and an annular concave groove upon the larger plane face adjacent 'to said peripheral face, substantially as and for the purpose specified.

2. In a tool for sharpening or shaving the edges of metal instruments, a pair of hardened steel disk-shaped dies having tapering peripheral faces and rotatively mounted in juxtaposition in the same plane, one of said so mounted the larger part of the peripheral surfaces of said rollers may be in juxtaposition, substantially as and for the purpose specified.

4. A combination tool for sharpening, finishing and setting the edges of metal instruments, consisting of a base plate to which a handle may be attached, an upright bracket upon one side of said plate, a pair of dies having cutting peripheral faces or edges rotatively and eccentrically mounted in juxtaposition upon the faces ot' said bracket, a pair of studs eccentrically or adj ustably mounted upon the opposite side of said plate, a pair of conveXly-tapered steel rollers rotatively mounted upon said studs, and jaws formed by a recess in said plate, substantially as and for the purpose herein specified.

In testimony whereof I affix my signature in presence of two witnesses.

ERICK NELSON.

Vitnesses:

GUDBRAND J. LOMEN, F. NV. LANE. 

